The bank has mistakenly paid some customers twice for errors it made in
calculating mortgage payments that left thousands with a capital shortfall.

Clydesdale Bank has made a fresh blunder after admitting it issued incorrect mortgage bills in 2009 - it has paid compensation twice to some customers.

Last week, the bank was fined £8.9m by the City watchdog after it miscalculated the repayments on more than 42,500 mortgages, failed to inform those affected - and then tried to increase customers’ monthly repayments to make up for shortfalls. The Financial Conduct Authority (FCA) said Clydesdale would compensate all customers negatively impacted.

But this week it emerged that the bank has erroneously paid money to customers who had already sought - and won - redress.

Clydesdale Bank mortgage customer Stan Semple, of the Shetland Islands in Scotland, wrote on Twitter that he complained about his capital shortfall in 2010 and was compensated for the full amount. Yet he has now received a letter from Clydesdale saying the capital shortfall has been credited to his mortgage for a second time.

Mr Semple said: “Clydesdale Bank mucked up my mortgage payments three years ago. I took them to the Financial Services Ombudsman and won - they wrote off the capital shortfall.

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“I've got a letter from them today saying they are writing off the shortfall amount and my mortgage has been credited with the amount. They can't even correct their errors properly. How many other folk who took them to the FOS will also be told they are getting money credited to their mortgage – again? Now I've got the hassle of contacting them and trying to explain to them that I can't take their money as I already got it three years ago.”

A Clydesdale spokesman said the bank is not yet sure how many customers are affected.

He added: "We have agreed with the FCA that where any compensation has been paid previously this is deducted from the amount being credited to the mortgage. There are a small number of cases where previous complaints may not have been taken into account and we're contacting these customers to apologise for any inconvenience and to confirm the exact standing of their account."

Around 22,000 people faced a shortfall at the end of the typical 25-year mortgage term following the bank’s error. This ranged from £20 to more than £18,000, with the average customer facing a shortfall of £970.

Instead of admitting its mistake, the bank unexpectedly increased mortgage repayments for all 22,000 customers to correct the error and to make up for their shortfalls.

Clydesdale sent letters to customers suggesting they had no alternative but to bring their repayments up to date, however customers had the right to reject these increases because the error was not their fault.

The FCA said: “Here Clydesdale failed in that basic duty and, when it discovered the problem, sought to pass all of the consequences on to its customers – expecting them to find the money to remedy mistakes which were entirely of Clydesdale's making.”